change composer.json for uninstallable version, as long as no PHP 7.1 version exists

composer.json

@@ -31,7 +31,7 @@
     }
   },
   "require": {
-    "php": "7.1.*",
+    "php": "8.1.*",
     "ext-ionCube-Loader": "*",
     "oxid-esales/oxideshop-ce": "6.0.x",
     "d3/modcfg": ">=5.1.0.0"